5 measurement of time: a day's journey The 's structure (or the plural with s') is often used to say how long things last. a day's journey twenty minutes' delay Noun + noun structures are also possible in expressions with numbers (▶ 125.3). a three-hour journey a twenty-minute delay Ref) 딥코쌤 카페. 1) a ninety-day tourist visa 2) a ninety days' tourist visa 모두 문법적으로는 가능하지만 비자와 관련된 실제 용례에선 'The over..